Sperry Marine Visionmaster FT ECDIS, User Manual

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ECDIS User Guide Radar
65900012 11-9
Trails
The display can be set to show decaying video
trails, showing the history of targets'
movements across the screen.
Trails are shown dependent on the trails mode
setting selected:
•
In Relative mode the trails indicate the
movement of the targets relative to own
ship.
•
In True mode the trails have own ship's speed applied (ground
based or water based).
Trails are only shown in Transmit Mode, not in Standby Mode.
The following Trails Modes are available:
•
SHORT
High rate of decay giving a short trail. Actual trail length will depend
on the range in use. See Trial Length Time table.
The trail time defaults to SHORT after power up.
•
LONG
Low rate of decay giving a long trail. Actual trail length will depend
on the range in use. See Trial Length Time table.
•
PERM
Permanent trail which does not decay. When the trail length
exceeds 60 minutes
>60min 0s is displayed.
•
OFF
Trails are removed from display.
•
RESET
Resets the Trails time to zero and momentarily clears all existing
trails from the display.
To reset the trails time click on the Reset button
Trail Length Time
The trail time shows the length of the trails in minutes and seconds. If the
trails are still below their maximum length, a count-up time is shown,
indicating how long they have been building up.
The selection of Long or Short Trails changes the trail time and is
dependent on the scale ratio in use. When the scale ratio is changed the
trail time restarts at zero before building up to the maximum time for the